Just to give something small back to the community - here is a picture of my 7x12 wiring setup.
I'm using ztw tb6560 controllers, ztw recommended 36v psu, arduino with grbl and still considering getting a separate psu for the steppers (meanwhile using my atx desktop psu).
I've got this 6.99$ fabian shelf from ikea, http://www.ikea.com/us/en/catalog/products/46693309/, cut it in length to 19 3/16 , and layed out the components so that when i am ready to move forward to the next step (3d printing) , i will have just the space for an extra psu and a sanguinololu.
For fastening, I've found it useful to use this spiral cable wrap from amazon:
http://www.amazon.com/gp/product/B003PP ... 05_s00_i00 (~9$ for 33 feet)
and cable holders from ace. (3$)
Hope this helps someone.
Best wishes, happy milling...